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The information provided within this Forum about localities is only given to allow reference to them. Any visit to any of the localities requires you to obtain full permission and relevant information prior to your visit. FMF is strictly against any illicit activities related to collecting minerals.
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| Search found 126 matches |
| Author | Message |
|---|---|
 Topic: Merry Christmas 2015 and Happy New Year! |
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| Gerhard Niklasch Replies: 28 Views: 34182 |
 Forum: Off-Topic and Introductions Posted: Jan 01, 2016 07:02 Subject: Re: Merry Christmas 2015 and Happy New Year! |
| Happy 2016, full of good crystals, to you all!
Cheers, Gerhard |
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| Topic: Parrish's collection |
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| Gerhard Niklasch Replies: 13 Views: 19504 |
Forum: Off-Topic and Introductions Posted: Nov 05, 2014 09:03 Subject: Re: Parrish's collection |
| The yellow flakes are Muscovite, and this specimen cannot have come from the Tsumeb Mine - certainly Erongo region, probably from one of the pegmatites on the (vast) territory of Davib Ost (Davib East ... | |
| Topic: Munich Show (Mineralientage) 2014 |
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| Gerhard Niklasch Replies: 80 Views: 173010 |
Forum: News about Shows Posted: Nov 04, 2014 12:28 Subject: Re: Munich Show (Mineralientage) 2014 |
| Thanks Roger,
Glad I'm not the only one who is a fan of my great-great-granddad's polished brass! (Even though Jordi prefers unpolished material ;-) ) Cheers, Gerhard |
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| Topic: Gail Spann's 2014 Denver Show Adventure Begins... |
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| Gerhard Niklasch Replies: 119 Views: 168322 |
Forum: Mineral Shows by Gail Spann Posted: Sep 12, 2014 11:06 Subject: Re: Gail Spann's 2014 Denver Show Adventure Begins... |
| Looks like a great time about to get even greater!
I couldn't help imagining what you had these three smart young ladies say for the photo op…. Cheers, Gerhard |
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| Topic: Steve Sorrell's 2014 Artwork... |
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| Gerhard Niklasch Replies: 40 Views: 68816 |
Forum: Mineral Art and Artists Posted: Aug 22, 2014 16:48 Subject: Re: Steve Sorrell's 2014 Artwork... |
| ...And here I am trying to reach behind my monitor, just to check whether I'll be able to see my fingertips through the Wulfie pane…
Fascinating how you've captured the transparency. Cheers, Ger ... |
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| Topic: Collection of Xiao-dong |
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| Gerhard Niklasch Replies: 115 Views: 148546 |
Forum: Collection photos and Collector's page Posted: Jul 14, 2014 08:40 Subject: Re: Collection of Xiao-dong |
| In our original German usage, the qualifier "Faden-xxx" does not automatically imply that xxx="Quartz", although quartz is by far the most common case. (For example, epidote/clino ... | |
| Topic: Collection of Xiao-dong |
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| Gerhard Niklasch Replies: 115 Views: 148546 |
Forum: Collection photos and Collector's page Posted: Jun 13, 2014 02:22 Subject: Re: Collection of Xiao-dong |
| Alexandrite under dual light (white and yellow LED)
That's a good one! I've never seen the effect visualized so clearly. It's remarkable that LEDs, with their limited and lacunary supply of wavel ... |
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| Topic: Puzzled by triangular hillocks on apatite prism faces |
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| Gerhard Niklasch Replies: 6 Views: 9454 |
Forum: Minerals and Mineralogy Posted: May 07, 2014 09:11 Subject: Re: Puzzled by triangular hillocks on apatite prism faces |
| A somewhat related observation:
While Quartz has 2-fold rotations which exchange the two ends of the c axis, its 'm' prism faces have no such 2-fold symmetry individually. (In an ideal crystal, the ... |
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| Topic: Steve Sorrell's 2014 Artwork... |
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| Gerhard Niklasch Replies: 40 Views: 68816 |
Forum: Mineral Art and Artists Posted: Apr 23, 2014 10:01 Subject: Re: Steve Sorrell's 2014 Artwork... |
| Amazing, Steve.
Sure beats my dilettantish attempts at photography, not to mention what I'd be able to draw… Cheers, Gerhard |
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| Topic: Daylight Fluorescent Hyalite Opal from Mexico |
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| Gerhard Niklasch Replies: 31 Views: 84411 |
Forum: Minerals and Mineralogy Posted: Mar 02, 2014 15:45 Subject: Re: Daylight Fluorescent Hyalite Opal from Mexico |
| Well, for a typical hand specimen of this material, we're talking about an order of magnitude of one U238 decay per second on average, plus the same rate from each of the unstable daughter isotopes al ... | |
| Topic: Daylight Fluorescent Hyalite Opal from Mexico |
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| Gerhard Niklasch Replies: 31 Views: 84411 |
Forum: Minerals and Mineralogy Posted: Mar 01, 2014 15:17 Subject: Re: Daylight Fluorescent Hyalite Opal from Mexico |
| Pleased to report that a specimen was delivered to my door today, and was eagerly unwrapped! Even behind closed windows under completely overcast skies, it is all yellowish-green and greenish-yellow ( ... | |
| Topic: Daylight Fluorescent Hyalite Opal from Mexico |
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| Gerhard Niklasch Replies: 31 Views: 84411 |
Forum: Minerals and Mineralogy Posted: Feb 25, 2014 02:49 Subject: Re: Daylight Fluorescent Hyalite Opal from Mexico |
| Thank you much for the clarification - yes, now the point is clear! It would have been something else if a 50µg sample had rivaled 60µg of Autunite. ;)
I'll soon have a chance to look at the lumine ... |
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| Topic: Daylight Fluorescent Hyalite Opal from Mexico |
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| Gerhard Niklasch Replies: 31 Views: 84411 |
Forum: Minerals and Mineralogy Posted: Feb 24, 2014 12:17 Subject: Re: Daylight Fluorescent Hyalite Opal from Mexico |
| Indeed!
To put the quantitative results in perspective: What was the size of the sample, not counting the matrix? And what are the y-axis units on the gamma spectrogram - "Counts", but ac ... |
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| Topic: Daylight Fluorescent Hyalite Opal from Mexico |
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| Gerhard Niklasch Replies: 31 Views: 84411 |
Forum: Minerals and Mineralogy Posted: Feb 19, 2014 09:59 Subject: Re: Daylight Fluorescent Hyalite Opal from Mexico |
| Looking forward to seeing a specimen in person (fortunately there are good sources :) )…
Let me encourage anyone in possession of one, and of a gem spectroscope and a not too cloudy sky, to aim the ... |
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| Topic: Tucson 2014 Show Report, Gail Spann Having Fun Again... |
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| Gerhard Niklasch Replies: 156 Views: 266708 |
Forum: Mineral Shows by Gail Spann Posted: Feb 14, 2014 12:32 Subject: Re: Tucson 2014 Show Report, Gail Spann Having Fun Again... |
| Gail, I love your lucky cobaltoan teddy bear :) :) - and may it bring you all the luck and health you need!
Thanks much for another exciting ongoing show report à la Spann! Cheers, Gerhard (eyes ... |
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| Topic: Munich Show (Mineralientage) 2013 |
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| Gerhard Niklasch Replies: 122 Views: 230014 |
Forum: News about Shows Posted: Oct 30, 2013 14:42 Subject: Re: Munich Show (Mineralientage) 2013 |
| I was particularly interested in one special exhibition that was a bit hidden behind the Collectors' Showcases… because I'll probably never again see so many shiny brass devices from my illustrious an ... | |
| Topic: Tetrahedron [111] penetration twin |
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| Gerhard Niklasch Replies: 17 Views: 70905 |
Forum: Minerals and Mineralogy Posted: Aug 19, 2013 12:25 Subject: Re: Tetrahedron |
| Hello Josele,
This latter shape, as I understand it, is the most common form of twinning in Tetrahedrite: As the Handbook of Mineralogy puts it, "on {111} around [111] as twin axis; contact an ... |
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| Topic: Tetrahedron [111] penetration twin |
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| Gerhard Niklasch Replies: 17 Views: 70905 |
Forum: Minerals and Mineralogy Posted: Aug 14, 2013 12:05 Subject: Re: Tetrahedron |
| Hello Josele,
no, a 90° rotation about any coordinate axis does not move the crystal structure of Tetrahedrite to a position that could also be obtained by a parallel translation without rotation. ... |
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| Topic: Munich Show (Mineralientage) 2012 |
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| Gerhard Niklasch Replies: 103 Views: 247628 |
Forum: News about Shows Posted: Oct 29, 2012 10:15 Subject: Re: Munich Show (Mineralientage) 2012 |
| Gerhard,
Thanks for mentioning the "African Thumbnail Treasures" segment of the broader Afrika exhibit. Alex Schauss and I organized the thumbnail display, and one correction of your des ... |
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| Topic: Munich Show (Mineralientage) 2012 |
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| Gerhard Niklasch Replies: 103 Views: 247628 |
Forum: News about Shows Posted: Oct 28, 2012 16:47 Subject: Re: Munich Show (Mineralientage) 2012 |
| Thank you much for your kind words, Antonio and Pierre!
My coverage is very far from comprehensive - I hope very much that more people are about to return from the show with photographic recollecti ... |
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